"Get away!" Luke twisted out from between the fog and the wall and the animal plopped down to all fours. He growled suddenly and Luke backed away, suddenly scared. "I gave you the costume! Don't get mad at me!" The dog lunged, but instead of attacking Luke he grabbed Luke's pile of clothing and bolted out of the dressing room. "Hey! Come back!" Luke started to chase him, but realized he was still stark naked. "Kid, bring my clothes back, please!"
All he heard was the sound of ripping cloth. Luke grabbed the boy's clothing and held it over his crotch in case anyone was out there, and went looking. The Great Dane was easy to find. He was busily shredding he remains of Luke's jeans, and the T-shirt was already a pile of cloth scraps. Thanks to Luke's preference for going commando, he didn't even have underpants to put on.
"Dammit, kid!" Luke was panicky - what if the clerk, or someone else came down here? "I can't run around naked! I'm not a dog!"
The Great Dane looked up at him and woofed, tail wagging, and then looked pointedly at...